A frame, a housing component, a printer core, and a printer

Abstract

The present application discloses a frame, a housing component, a printer core, and a printer. The frame is provided with a housing portion, and a partition wall protrudes from the bottom wall of the housing portion. The two ends of the partition wall are respectively connected to the peripheral wall of the housing portion. The partition wall has at least a first section that separates the pinion portion of the final reduction gear from the large gear portion of the previous-stage reduction gear. At least a part of the projection of the first section on a first plane perpendicular to the rotation axis of the drive shaft coincides with the projection of the large gear portion of the final reduction gear on the first plane. The front edge of the first section located in the overlapping part and away from the bottom wall is close to the large gear portion of the final reduction gear. The above housing component, printer core, and printer adopt the above frame. The above technical solution can improve the influence of dust, sand particles, or other foreign objects on the reduction drive.

Description

Technical Field

[0001] The present application relates to the field of printing devices, and particularly to a frame, a housing assembly, a printer core, and a printer. Background Art

[0002] In the prior art, a printer core, especially a printer core of a thermal printer for bill printing, often has a frame. A driving roller, a print head, a motor, an input gear, an output gear, at least two-stage reduction gears, and a cover are installed on the frame. Among them, the driving roller is rotatably connected to the frame, the print head is installed on the frame and is arranged opposite to the driving roller, the motor and the cover are fixedly connected to the frame, the rotation axis of the driving roller and the rotation axis of the output end of the motor are parallel to each other. Each stage of reduction gear is provided with a small gear part and a large gear part that rotate coaxially. The input gear is non-rotatably connected to the output end of the motor and meshes with the large gear part of the primary reduction gear. The output gear is non-rotatably connected to the driving roller and meshes with the small gear part of the final reduction gear. The small gear part of the previous stage of reduction gear in adjacent two-stage reduction gears meshes with the large gear part of the next stage of reduction gear. The rotation axes of each stage of reduction gear are parallel to each other. The frame is generally provided with a housing part. The housing part is provided with a bottom wall perpendicular to the rotation axis and a peripheral wall surrounding the periphery of the bottom wall. The bottom wall and the peripheral wall enclose a housing groove for housing the input gear, the output gear, and each stage of reduction gear. The housing groove is provided with an opening extending outward along the rotation axis direction and a window suitable for exposing a part of the outer periphery of the output gear. The opening is suitable for being shielded by the cover.

[0003] Due to the existence of the window, the housing groove communicates with the outside in the above printer core. Therefore, in a relatively harsh environment, dust, sand grains, or other foreign matters are likely to enter the housing groove, affecting the reduction transmission between the input gear, the output gear, and each stage of reduction gear, and further affecting the printing quality. In severe cases, the reduction transmission may fail, causing the printer core to be unable to work. Summary of the Invention

[0004] The purpose of the present application is to overcome the above-mentioned defects or problems in the background art, and provide a frame, a housing assembly, a printer core, and a printer, which can improve the influence of dust, sand grains, or other foreign matters on the reduction transmission.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] The first technical solution relates to a frame for accommodating a motor, a driving roller, an input gear, an output gear, and at least two stages of reduction gears of a printer core. The rotation axis of the driving roller is parallel to the rotation axis of the output end of the motor. Each stage of reduction gear is provided with a pinion part and a gear part that rotate coaxially. The input gear is non-rotatably connected to the output end of the motor and meshes with the gear part of the primary reduction gear. The output gear is non-rotatably connected to the driving roller and meshes with the pinion part of the final reduction gear. The pinion part of the previous stage of reduction gear in adjacent two stages of reduction gears meshes with the gear part of the next stage of reduction gear. The rotation axes of each stage of reduction gear are parallel to each other. The frame is provided with a receiving part. The receiving part is provided with a bottom wall perpendicular to the rotation axis of the driving roller and a peripheral wall surrounding the periphery of the bottom wall. The bottom wall and the peripheral wall enclose a receiving groove for accommodating the input gear, the output gear, and each stage of reduction gear. The receiving groove is provided with an opening extending outward along the rotation axis direction and a window adapted to expose a part of the outer periphery of the output gear. The opening is adapted to be shielded by a cover body fixedly connected to the frame. The pinion part of the final reduction gear and the gear part of its previous stage of reduction gear are configured such that at least one first plane perpendicular to the rotation axis of the driving roller intersects both of them. The bottom wall is convexly provided with a partition wall. The two ends of the partition wall are respectively connected to the peripheral wall. The partition wall at least has a first section that separates the pinion part of the final reduction gear and the gear part of its previous stage of reduction gear. At least a part of the projection of the first section on the first plane coincides with the projection of the gear part of the final reduction gear on the first plane. The outer edge of the first section located in the coincident part and away from the bottom wall is close to the gear part of the final reduction gear.

[0007] The second technical solution is based on the first technical solution. Among them, the partition wall further has a second section connected to the first section. The connection position of the second section and the first section is close to the outer periphery of the gear part of the final reduction gear. The outer edge of the second section away from the bottom wall is close to the cover body.

[0008] The third technical solution is based on the second technical solution. Among them, the driving roller and the motor are arranged on one side of the bottom wall, and the input gear, the output gear, and each stage of reduction gear are arranged on the other side of the bottom wall.

[0009] The fourth technical solution is based on the third technical solution. Among them, the peripheral wall is further provided with a sand discharge hole. The first surface of the partition wall close to the pinion part of the final reduction gear is connected to the edge of the sand discharge hole away from the window.

[0010] The fifth technical solution is based on the fourth technical solution. Among them, the part of the first surface close to the sand discharge hole is inclined away from the final reduction gear in the direction towards the sand discharge hole.

[0011] The sixth technical solution is based on the fifth technical solution, wherein the second section is closer to the sand discharge hole than the first section.

[0012] The seventh technical solution relates to a housing assembly, which includes a cover body and a frame as described in any one of the first to sixth technical solutions. The cover body is fixedly connected to the frame and shields the opening.

[0013] The eighth technical solution is based on the seventh technical solution, wherein the cover body is provided with a shielding portion near the window, and at least a part of the projection of the shielding portion on the rotation axis of the driving roller coincides with at least a part of the projection of the large gear portion of the final reduction gear on the rotation axis of the driving roller.

[0014] The ninth technical solution relates to a printer core, which includes a driving roller, a print head, a motor, an input gear, an output gear, at least two stages of reduction gears, and a housing assembly as described in the seventh or eighth technical solution; the driving roller is rotatably connected to the frame, the print head is installed on the frame and is disposed opposite to the driving roller, the motor is fixedly connected to the frame, the rotation axis of the driving roller and the rotation axis of the output end of the motor are parallel to each other, each stage of reduction gear is provided with a coaxially rotating small gear portion and a large gear portion, the input gear is non-rotatably connected to the output end of the motor and meshes with the large gear portion of the primary reduction gear, the output gear is non-rotatably connected to the driving roller and meshes with the small gear portion of the final reduction gear, the small gear portion of the previous stage of reduction gear in two adjacent stages of reduction gears meshes with the large gear portion of the next stage of reduction gear, and the rotation axes of each stage of reduction gear are parallel to each other.

[0015] The tenth technical solution relates to a printer, which includes the printer core described in the ninth technical solution.

[0016] Compared with the prior art, the above solutions have the following beneficial effects:

[0017] The first technical solution uses a partition wall protruding from the bottom wall to achieve partitioning, which not only helps to reduce costs, but also can prevent the situation where the dust-proof sheet displaces relative to the accommodating portion and interferes with the reduction transmission compared with the technical solution using a dust-proof sheet.

[0018] In the first technical solution, the two ends of the partition wall are respectively connected to the peripheral wall, and the accommodating groove can be divided into an open area communicating with the window and a closed area that is generally not connected to the window, so that dust, sand particles or other foreign objects are not easily introduced into the closed area, thereby improving the influence of dust, sand particles or other foreign objects on the reduction transmission and improving the printing quality.

[0019] In the first technical solution, the pinion part of the final reduction gear and the gear part of its previous reduction gear are arranged such that at least one first plane perpendicular to the rotation axis of the driving roller intersects both of them, so that the pinion part of the final reduction gear and the gear part of the previous reduction gear are approximately in the same position in the rotation axis direction. On this premise, the partition wall has a first section that separates the pinion part of the final reduction gear and the gear part of the previous reduction gear, and at least part of the projection of the first section on the first plane coincides with the projection of the gear part of the final reduction gear on the first plane. The overlapping part is close to the gear part of the final reduction gear away from the outer edge of the bottom wall, which not only improves the separation effect of the partition wall in the first section and enhances the protection of other gears located in the closed area and approximately in the same position as the pinion part of the final reduction gear in the rotation axis direction, but also can support the gear part of the final reduction gear when the printer core drops and causes the driving roller to displace axially and the output gear impacts the gear part of the final reduction gear, so that the final reduction gear will not skew due to the impact, avoiding the situation where the printer core cannot work due to meshing failure.

[0020] The second technical solution improves the protection of other gears located in the closed area and approximately in the same position as the gear part of the final reduction gear in the rotation axis direction by setting a second section, making the connection position of the second section and the first section close to the outer periphery of the gear part of the final reduction gear, and at the same time arranging the outer edge of the second section away from the bottom wall close to the cover body.

[0021] In the third technical solution, the driving roller and the motor are arranged on one side of the bottom wall, and the input gear, the output gear and each reduction gear are arranged on the other side of the bottom wall. This makes the input gear and the output gear located close to the bottom wall, and the pinion part of the primary reduction gear and the gear part of the final reduction gear located farther from the bottom wall relative to the input gear and the output gear. And in the first technical solution, the pinion part of the final reduction gear and the gear part of the previous reduction gear are arranged approximately in the same position in the rotation axis direction. This makes the input gear, the output gear and the gear parts and pinion parts of each reduction gear approximately form a row close to the bottom wall and another row away from the bottom wall, thereby reducing the thickness of the accommodating part in the rotation axis direction and making the structure of the frame more compact.

[0022] The fourth technical solution enables dust, sand grains or other foreign objects entering the open area to be discharged more smoothly from the sand discharge holes by setting sand discharge holes on the peripheral wall and arranging the first surface of the partition wall to connect with the edge of the sand discharge holes away from the window, and also makes the setting of the sand discharge holes not affect the sealing of the closed area.

[0023] In the fifth technical solution, the part of the first surface of the partition wall close to the sand discharge hole is inclined away from the last-stage deceleration zone wheel in the direction towards the sand discharge hole, so that larger foreign objects can naturally roll down from the first surface to the sand discharge hole due to gravity and be discharged from the sand discharge hole out of the frame.

[0024] In the sixth technical solution, the second section is arranged closer to the sand discharge hole than the first section, which is more conducive to discharging the dust, sand particles or other foreign objects collected on the first surface from the sand discharge hole. This is because the thickness of the second section of the partition wall in the direction of the rotation axis is thicker than that of the first section in the direction of the rotation axis and is close to the cover body.

[0025] The accommodating component in the seventh technical solution has the corresponding technical effects of the technical solutions it includes.

[0026] In the eighth technical solution, at least part of the projection of the shielding part on the rotation axis of the driving roller coincides with the projection of the large gear part of the last-stage reduction gear on the rotation axis of the driving roller, so that the shielding part can shield the large gear part of the last-stage reduction gear, reducing the thickness of the window in the direction of the rotation axis and improving the sealing of the open area, making it more difficult for dust, sand particles or other foreign objects to enter the open area.

[0027] The printer core in the ninth technical solution and the printer in the tenth technical solution have the corresponding technical effects of the technical solutions they include. Brief Description of the Drawings

[0028] To more clearly illustrate the technical solutions of the embodiments, the following briefly introduces the drawings to be used:

[0029] Figure 1 Isometric exploded view of the printer core in the embodiment;

[0030] Figure 2 Plan exploded view of the printer core in the embodiment;

[0031] Figure 3 Right view of the printer core in the embodiment;

[0032] Figure 4 Is Figure 3 A-A sectional view of

[0033] Figure 5 Is Figure 4 Enlarged view of part B of

[0034] Figure 6 Right view of the printer core after removing the cover body in the embodiment;

[0035] Figure 7 Rear view of the printer core in the embodiment;

[0036] Figure 8 IsFigure 7 CC section view.

[0037] Description of main reference numerals:

[0038] Printing mechanism 1, frame 2, driving roller 3, printing head 4, motor 5, input gear 6, output gear 7, reduction gear 8, cover body 9, primary reduction gear 10, small gear portion 10a of primary reduction gear, large gear portion 10b of primary reduction gear, final reduction gear 11, small gear portion 11a of final reduction gear, large gear portion 11b of final reduction gear, accommodating portion 12, bottom wall 13, peripheral wall 14, accommodating groove 15, opening 16, window 17, sand discharge hole 18, partition wall 19, first section 20, second section 21, first surface 22, shielding portion 23, first plane 24, rotation axis 25 of driving roller. DETAILED DESCRIPTION

[0039] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0040] In the claims and the specification, unless otherwise defined, the term "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0041] In the claims and the description, unless otherwise defined, the terms "includes", "has" and their variations mean "including but not limited to".

[0042] In the claims and the specification, unless otherwise defined, the term "rotation axis direction" refers to the rotation axis direction of the driving roller, and is defined as bidirectional.

[0043] In the claims and the specification, unless otherwise defined, the term "outward" refers to a direction away from the driving roller.

[0044] In the claims and the specification, unless otherwise defined, the term "non-rotational connection" refers to a connection method in which there is no relative rotational relationship between two objects, including a fixed connection, a connection formed by plug-in fit of non-rotating surfaces, or other connection methods that can be imagined by those skilled in the art and can prevent the two objects from rotating relative to each other.

[0045] In the claims and description, unless otherwise specified, the term "small gear portion" refers to a gear portion having a smaller number of teeth than the large gear portion of the subsequent reduction gear, and the term "large gear portion" refers to a gear portion having a larger number of teeth than the small gear portion of the previous reduction gear.

[0046] The technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] Embodiment

[0048] Refer to Figure 1 , Figure 1 which shows the printer core 1 in the embodiment. As Figure 1 shown, the printer core 1 includes a frame 2, a driving roller 3, a print head 4, a motor 5, an input gear 6, an output gear 7, a two-stage reduction gear 8, and a cover 9.

[0049] As Figure 1 shown, the driving roller 3 is rotatably connected to the frame 2, and the print head 4 is installed on the frame 2 and is disposed opposite to the driving roller 3. Specifically, the print head 4 is installed on the frame 2 through an elastic mechanism, so that the print head 4 has a clamping force towards the driving roller 3. The printing paper passes through between the driving roller 3 and the print head 4, and the driving roller 3 drives the printing paper to move in the paper output direction by rotation, and the print head 4 heats the printing paper, so that the printing content can be displayed on the printing paper. The motor 5 is fixedly connected to the frame 2 and drives the driving roller 3 to rotate at a reduced speed through the input gear 6, the output gear 7, and the two-stage reduction gear 8. The rotation axis 25 of the driving roller is parallel to the rotation axis of the output end of the motor. In this embodiment, the printer core 1 has a two-stage reduction gear 8. In other embodiments, the reduction gear 8 may also have more than two stages.

[0050] As Figure 2 shown, each stage of reduction gear (10, 11) is provided with a pinion part (10a, 11a) and a gear part (10b, 11b) that rotate coaxially. The input gear 6 is non-rotatably connected to the output end of the motor 5 and meshes with the gear part 10b of the primary reduction gear, the output gear 7 is non-rotatably connected to the driving roller 3 and meshes with the pinion part 11a of the final reduction gear, and the pinion part (such as 10a) of the previous stage of reduction gear in the adjacent two-stage reduction gears 8 meshes with the gear part (such as 11b) of the next stage of reduction gear. The rotation axes of each stage of reduction gear 8 are parallel to each other. By the input gear 6 meshing with the gear part 10b of the primary reduction gear, the pinion part 10a of the primary reduction gear meshing with the gear part 11b of the final reduction gear, and the pinion part 11a of the final reduction gear meshing with the output gear 7, a speed reduction transmission from the output end of the motor 5 to the driving roller 7 is achieved. In this embodiment, the pinion part 11a of the final reduction gear and the gear part 10b of the primary reduction gear are further configured such that at least one first plane 24 perpendicular to the rotation axis 25 of the driving roller intersects both of them, so that the pinion part 11a of the final reduction gear and the gear part 10b of the primary reduction gear are substantially in the same position in the rotation axis direction.

[0051] As Figure 1As shown in the figure, the frame 2 includes two parts: a supporting part and a receiving part 12. The supporting part is located on the left side and extends along the rotation axis direction of the driving roller 3. Both the driving roller 3 and the print head 4 are installed on the supporting part. The receiving part 12 is located at the right end of the frame 2 along the rotation axis direction. The receiving part 12 is provided with a bottom wall 13 perpendicular to the rotation axis 25 of the driving roller and a peripheral wall 14 surrounding the periphery of the bottom wall 13. The bottom wall 13 and the peripheral wall 14 enclose a receiving groove 15, and the receiving groove 15 is adapted to receive the input gear 6, the output gear 7 and the reduction gears 8 at all levels. The receiving groove 15 is provided with an opening 16 extending outward along the rotation axis direction and a window 17 adapted to expose a part of the outer periphery of the output gear 7. The window 17 is located at the upper part of the receiving groove 15. In this embodiment, the motor 5 is fixedly connected to the bottom wall 13, the driving roller 3 and the motor 5 are arranged on the left side of the bottom wall 13, and the input gear 6, the output gear 7 and the reduction gears 8 at all levels are all arranged on the right side of the bottom wall 13. Thus, as Figure 2 shown, the input gear 6 and the output gear 7 are located at positions close to the bottom wall 13, while the pinion part 10a of the primary reduction gear and the gear part 11b of the final reduction gear are located at positions farther from the bottom wall 13. As described above, the pinion part 11a of the final reduction gear and the gear part 10b of the primary reduction gear are substantially in the same position in the rotation axis direction, which makes the input gear 6, the output gear 7, the gear part 10b of the primary reduction gear and the pinion part 11a of the final reduction gear located in a row closer to the bottom wall 13 in the rotation axis direction, while the pinion part 10a of the primary reduction gear and the gear part 11b of the final reduction gear are located in a row farther from the bottom wall 13 and closer to the cover body 9 in the rotation axis direction, thereby reducing the thickness of the receiving part 12 in the rotation axis direction and making the structure of the frame 2 more compact.

[0052] As Figure 1 , Figure 7 and Figure 8 shown, in this embodiment, the peripheral wall 14 of the receiving part 12 is further provided with a sand discharge hole 18.

[0053] As Figure 1 and Figure 5 shown, the bottom wall 13 is convexly provided with a partition wall 19 outward. As Figure 8 shown, both ends of the partition wall 19 are respectively connected to the peripheral wall 14. As Figure 1 , Figure 5 and Figure 7 shown, the partition wall 19 has a first section 20, and the first section 20 separates the pinion part 11a of the final reduction gear from the gear part (the gear part 10b of the primary reduction gear in this embodiment) of its previous stage reduction gear. And as Figure 5As shown, the projection of at least a part of the first section 20 on the first plane 24 coincides with the projection of the large gear portion 11b of the final reduction gear on the first plane 24. The outer edge of the first section 20 located in the overlapping part and away from the bottom wall 13 is close to the surface of the large gear portion 11b of the final reduction gear opposite to the bottom wall 13. As Figure 1 , Figure 6 and Figure 8 shown, the partition wall 19 further has a second section 21. The second section 21 is connected to the first section 20, and the connection position is close to the outer peripheral edge of the large gear portion 11b of the final reduction gear. The outer edge of the second section 21 away from the bottom wall 13 is close to the cover body. As Figure 8 shown, in this embodiment, the first surface 22 of the partition wall 19 close to the small gear portion 11a of the final reduction gear is substantially continuous. The first surface 22 is connected to the edge of the sand discharge hole 18 away from the window 17. Specifically, since the second section 21 is closer to the sand discharge hole 18 than the first section 20, the first surface 22 of the second section 21 is connected to the edge of the sand discharge hole 18 away from the window 17. As Figure 1 and Figure 8 shown, the first surface 22 of the second section 21 (i.e., the part of the first surface 22 close to the sand discharge hole 18) is inclined in the direction away from the final reduction gear 11 towards the sand discharge hole 18.

[0054] As Figure 3 and Figure 4 shown, the cover body 9 is fixedly connected to the frame 2 and shields the opening 16. Figure 5 shown, in this embodiment, the cover body 9 is provided with a shielding portion 23 near the window 17. The projection of the shielding portion 23 on the rotation axis 25 of the driving roller at least partially coincides with the projection of the large gear portion 11b of the final reduction gear on the rotation axis 25 of the driving roller, so that the shielding portion 23 can shield the large gear portion 11b of the final reduction gear.

[0055] In this embodiment, the frame 2 and the cover body 9 form a housing assembly.

[0056] This embodiment also discloses a printer including the printer core 1 in this embodiment. Generally, the above printer at least includes a housing and the printer core 1. The housing defines a printing paper roll accommodating cavity for accommodating a printing paper roll. The printing paper is drawn out from the printing paper roll and led to the paper outlet on the housing through between the driving roller 3 and the printing head 4. Of course, the above printer may also have other structures or shapes as long as it includes the printer core 1 in this embodiment.

[0057] In this embodiment, the partition is realized by the partition wall 19 protruding from the bottom wall 13. This not only helps to reduce costs, but also can prevent the situation that the dust-proof sheet displaces relative to the accommodating portion 12 and interferes with the reduction drive compared with the technical solution using a dust-proof sheet to realize the partition.

[0058] In this embodiment, both ends of the partition wall 19 are respectively connected to the peripheral wall 14, and can divide the accommodation groove 15 into an open area communicating with the window 17 and a closed area that is substantially not connected to the window 17, so that dust, sand particles or other foreign matters are not easily introduced into the closed area, thereby improving the influence of dust, sand particles or other foreign matters on the reduction drive and improving the printing quality.

[0059] In this embodiment, at least one first plane 24 perpendicular to the rotation axis 25 of the drive roller is configured to intersect both the pinion portion 11a of the final reduction gear and the gear portion 10b of its previous reduction gear, so that the pinion portion 11a of the final reduction gear and the gear portion 10b of the previous reduction gear are substantially in the same position in the rotation axis direction. On this premise, the partition wall 19 has a first section 20 that separates the pinion portion 11a of the final reduction gear and the gear portion 10b of the previous reduction gear, and at least a part of the projection of the first section 20 on the first plane 24 coincides with the projection of the gear portion 11b of the final reduction gear on the first plane 24, and the overlapping part is close to the gear portion 11b of the final reduction gear away from the outer edge of the bottom wall 13. This not only improves the separation effect of the partition wall 19 in the first section 20 and enhances the protection of other gears located in the closed area and substantially in the same position as the pinion portion 11a of the final reduction gear in the rotation axis direction, but also can support the gear portion 11b of the final reduction gear when the printer core 1 drops and causes the drive roller 3 to displace axially and the output gear 7 impacts the gear portion 11b of the final reduction gear, so that the final reduction gear 11 will not be deflected due to the impact, avoiding the situation where the printer core 1 cannot work due to meshing failure.

[0060] In this embodiment, by providing a second section 21 and making the connection position of the second section 21 and the first section 20 close to the outer periphery of the gear portion 11b of the final reduction gear, and at the same time configuring the outer edge of the second section 21 away from the bottom wall 13 to be close to the cover body 9, the protection of other gears located in the closed area and substantially in the same position as the gear portion 11b of the final reduction gear in the rotation axis direction is improved.

[0061] In this embodiment, by providing a sand discharge hole 18 in the peripheral wall 14 and configuring the first surface 22 of the partition wall 19 to be connected to the edge of the sand discharge hole 18 away from the window 17, the dust, sand particles or other foreign matters entering the open area can be discharged more smoothly from the sand discharge hole 18, and the setting of the sand discharge hole 18 does not affect the sealing of the closed area.

[0062] In this embodiment, a portion of the first surface 22 of the partition wall 19 near the sand discharge hole 18 is inclined away from the final reduction gear 11 in the direction towards the sand discharge hole 18, so that larger foreign objects can naturally roll down from the first surface 22 to the sand discharge hole 18 due to gravity and be discharged from the sand discharge hole 18 out of the frame 2.

[0063] In this embodiment, the second section 20 is arranged closer to the sand discharge hole than the first section 21, which is more conducive to discharging the dust, sand particles or other foreign objects from the sand discharge hole 18 after the first surface 22 collects them. This is because the thickness of the second section 21 of the partition wall 19 in the direction of the rotation axis is thicker than that of the first section 20 in the direction of the rotation axis and is close to the cover body 9.

[0064] In this embodiment, the shielding portion 23 can shield the large gear portion 11b of the final reduction gear, reducing the thickness of the window 17 in the direction of the rotation axis, improving the sealing of the open area, and making it more difficult for dust, sand particles or other foreign objects to enter the open area.

[0065] The descriptions of the above specification and embodiments are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application.

Claims

1. A frame (2) for accommodating a motor (5), a driving roller (3), an input gear (6), an output gear (7) and at least two stages of reduction gears (8) of a printer core. The rotation axis of the driving roller (3) is parallel to the rotation axis of the output end of the motor (5). Each stage of reduction gear (8) is provided with a pinion part (10a, 11a) and a gear part (10b, 11b) that rotate coaxially. The input gear (6) is non-rotatably connected to the output end of the motor (5) and meshes with the gear part (10b) of the primary reduction gear. The output gear (7) is non-rotatably connected to the driving roller (3) and meshes with the pinion part (11a) of the final reduction gear. The pinion part (10a) of the previous stage of reduction gear in adjacent two stages of reduction gears meshes with the gear part (11b) of the next stage of reduction gear. The rotation axes of each stage of reduction gear (8) are parallel to each other; The frame (2) is provided with a receiving part (12). The receiving part (12) is provided with a bottom wall (13) perpendicular to the rotation axis of the driving roller (3) and a peripheral wall (14) surrounding the periphery of the bottom wall (13). The bottom wall (13) and the peripheral wall (14) enclose a receiving groove (15) for accommodating the input gear (6), the output gear (7) and each stage of reduction gear (8). The receiving groove (15) is provided with an opening (16) extending outward along the rotation axis direction and a window (17) suitable for exposing a part of the outer periphery of the output gear (7). The opening (16) is suitable for being shielded by a cover body (9) fixedly connected to the frame (2); It is characterized in that The pinion part (11a) of the final reduction gear and the gear part (10b) of its previous stage of reduction gear are configured such that at least one first plane (24) perpendicular to the rotation axis of the driving roller (3) intersects both of them; The bottom wall (13) is convexly provided with a partition wall (19). The two ends of the partition wall (19) are respectively connected to the peripheral wall (14); The partition wall (19) at least has a first section (20) that separates the pinion part (11a) of the final reduction gear and the gear part (11b) of its previous stage of reduction gear. At least a part of the projection of the first section (20) on the first plane (24) coincides with the projection of the gear part (11b) of the final reduction gear on the first plane (24). The outer edge of the first section (20) located in the overlapping part and away from the bottom wall (13) is close to the gear part (11b) of the final reduction gear.

2. A frame (2) according to claim 1, characterized in that, The partition wall (19) also has a second section (21) connected to the first section (20). The connection position of the second section (21) and the first section (20) is close to the outer periphery of the gear part (11b) of the final reduction gear. The outer edge of the second section (21) away from the bottom wall (13) is close to the cover body (9).

3. A frame (2) according to claim 2, characterized in that, The driving roller (3) and the motor (5) are arranged on one side of the bottom wall (13), and the input gear (6), the output gear (7) and each stage of reduction gear (8) are arranged on the other side of the bottom wall (13).

4. A frame (2) as claimed in claim 3, characterized in that, The peripheral wall (14) is further provided with a sand discharge hole (18), and a first surface (22) of the partition wall (19) close to the pinion part (11a) of the final-stage reduction gear is connected to an edge of the sand discharge hole (18) far from the window (17).

5. A frame (2) according to claim 4, characterized in that, A portion of the first surface (22) close to the sand discharge hole (18) is inclined away from the final-stage reduction gear in a direction toward the sand discharge hole (18).

6. A frame (2) as claimed in claim 5, characterized in that, The second section (21) is closer to the sand discharge hole (18) than the first section (20).

7. A receiving component, characterized in that, Comprising a cover body (9) and the frame (2) according to any one of claims 1 to 6, the cover body (9) is fixedly connected to the frame (2) and shields the opening (16).

8. The accommodating component according to claim 7, characterized in that, The cover body (9) is provided with a shielding portion (23) close to the window (17), and a projection of the shielding portion (23) on the rotation axis of the driving roller (3) at least partially coincides with a projection of the large gear portion (11b) of the final-stage reduction gear on the rotation axis of the driving roller (3).

9. A printer core (1), characterized in that Comprising a driving roller (3), a print head (4), a motor (5), an input gear (6), an output gear (7), at least two stages of reduction gears (8) and the accommodating assembly according to claim 7 or 8; the driving roller (3) is rotatably connected to the frame (2), the print head (4) is installed on the frame (2) and is arranged opposite to the driving roller (3), the motor (5) is fixedly connected to the frame (2), the rotation axis of the driving roller (3) and the rotation axis of the output end of the motor (5) are parallel to each other, each stage of reduction gear (8) is provided with a coaxially rotating pinion part (10a, 11a) and a large gear part (10b, 11b), the input gear (6) is non-rotatably connected to the output end of the motor (5) and meshes with the large gear part (10b) of the primary reduction gear, the output gear (7) is non-rotatably connected to the driving roller (3) and meshes with the pinion part (11a) of the final-stage reduction gear, the pinion part (10a) of the previous stage of reduction gear in adjacent two stages of reduction gears meshes with the large gear part (11b) of the next stage of reduction gear, and the rotation axes of each stage of reduction gear (8) are parallel to each other.

10. A printer, characterized in that, Comprising a printer core (1) according to claim 9.

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